Method and apparatus for attaching microelectronic substrates and support members

ABSTRACT

A microelectronic package and method for forming such packages. In one embodiment, the package can be formed by providing a support member having a first surface, a second surface facing opposite the first surface, and a projection extending away from the first surface. A quantity of adhesive material can be applied to the projection to form an attachment structure, and the adhesive material can be connected to a microelectronic substrate with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member. The microelectronic substrate and the support member can then be electrically coupled, for example, with a wire bond. In one embodiment, the projection can be formed by disposing a first material on a support member while the first material is at least partially flowable, reducing the flowability of the first material, and disposing a second material (such as the adhesive) on the first material.

BACKGROUND

[0001] Conventional microelectronic device packages typically include a microelectronic substrate or die attached to a support member, such as a printed circuit board. Bond pads or other terminals on the die are electrically connected to corresponding terminals of the support member, for example, with wire bonds. The die, the support member, and the wire bonds are then encapsulated with a protective epoxy material to form a device package. The package can then be electrically connected to other microelectronic devices or circuits, for example, in a consumer or industrial electronic product such as a computer.

[0002] In one existing arrangement shown in FIG. 1A, a microelectronic device package 10 a includes a support member 20 having an aperture 21. A microelectronic substrate 30 is attached to the support member 20 with strips of adhesive tape 40 a. Substrate bond pads 31 are then electrically connected to corresponding support member bond pads 22 with wire bonds 32 that extend through the aperture 21. An encapsulant 11, which includes a suspension of filler material particles 12, is disposed over the microelectronic substrate 30 and the wire bonds 32. The sizes of the filler material particles 12 in any given package 10 a typically range in a standard distribution about a selected mean value.

[0003] One drawback with the foregoing arrangement is that the filler material particles 12 (and in particular, the largest filler material particles 12) can impinge on and damage the microelectronic substrate 30. Because the larger particles 12 tend to settle toward the support members 20, one approach to addressing the foregoing drawback is to increase the separation distance between the microelectronic substrate 30 and the support member 20 by increasing the thickness of the tape 40 a. Accordingly, an advantage of the tape 40 a is that it can be selected to have a thickness sufficient to provide the desired separation between the microelectronic substrate 30 and the support member 20. However, a drawback with the tape 40 a is that it can be expensive to install. A further drawback is that the tape 40 a can be difficult to accurately position between the support member 20 and the microelectronic substrate 30.

[0004]FIG. 1B illustrates another existing microelectronic device package 10 b having a microelectronic substrate 30 attached to the support member 20 with screen printed strips of epoxy 40 b. The epoxy 40 b can be easier than the tape 40 a (FIG. 1A) to dispense on the support member 20, but can have other problems. For example, the epoxy 40 b can apply stresses to the sides of the microelectronic substrate 30, but it may be difficult to control how much of the sides the epoxy 40 b contacts, making it difficult to control the stress applied to the microelectronic substrate 30. Another drawback is that the thickness of the epoxy 40 b typically ranges from about 8 microns to about 25 microns, while in some cases the desired separation between microelectronic substrate 30 and the support member 20 is greater than about 75 microns, for example, to avoid the particle impingement problem described above. Still another drawback is that the interfaces between the epoxy 40 b and the encapsulant 11 (one located to the outside of the microelectronic substrate 30 and the other located beneath the microelectronic substrate 30) can delaminate, which can reduce the integrity of the package 10 b. The interface located beneath the microelectronic substrate 30 can also create a high stress region that can cause a crack C to form in the encapsulant 11. The crack C can damage the integrity of the wire bond 32.

[0005] Another problem with both the tape 40 a and the epoxy 40 b is that the coefficient of thermal expansion (CTE) of these components is typically substantially different than the CTE of other components of the package. For example, the microelectronic substrate 30 typically has a CTE of about 3 parts per million (ppm) per ° C., the support member 20 typically has a coefficient CTE of about 50 ppm/° C., and the encapsulant 11 typically has a CTE of from about 10-15 ppm/° C. By contrast, the tape 40 a and the epoxy 40 b each have a CTE of about 150-400 ppm/° C. Accordingly, both the tape 40 a and the epoxy 40 b can exert substantial shear and/or normal forces on the microelectronic substrate 30 during thermal excursions for curing, reflow and other processes. These forces can crack the microelectronic substrate 30, and/or delaminate layers from the microelectronic substrate 30 and/or the support member 20, causing the package to fail.

SUMMARY

[0006] The present invention is directed toward microelectronic packages and methods for forming such packages. A method in accordance with one aspect of the invention includes providing a support member having a first surface, a second surface facing opposite the first surface, and a projection extending away from the first surface. The method can further include forming an attachment structure by applying a quantity of adhesive material to the projection and connecting the adhesive material to the microelectronic substrate with a surface of the microelectronic substrate facing toward the first surface of the support member and with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member. The microelectronic substrate and the support member can then be electrically connected, for example, with a wire bond.

[0007] In one aspect of the invention, the projection can include an electrically conductive material, such as copper or aluminum. Alternatively, the projection can have the same composition as the adhesive material. In another aspect of the invention, the attachment structure can be formed by disposing a first quantity of material on at least one of the microelectronic substrate and the support member while the first quantity of material is at least partially flowable. The flowability of the first quantity of material can be at least partially reduced, and a second quantity of material can be applied to the attachment structure while the second quantity of material is at least partially flowable. The attachment structure can then be connected to the other of the microelectronic substrate and the support member.

[0008] In other aspects of the invention, the attachment structure can have a first bond strength at a joint with the support member, and a second bond strength at a joint with the microelectronic substrate, with the second bond strength greater than the first bond strength. The height of the attachment structure can be about 35 microns or more in one embodiment, and can exceed 75 microns in another embodiment. In still further aspects of the invention, the attachment structure can be connected between two microelectronic substrates.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]FIG. 1A is a cross-sectional view of a microelectronic device package having a tape adhesive in accordance with the prior art.

[0010]FIG. 1B is a cross-sectional view of a microelectronic device package having an epoxy adhesive in accordance with the prior art.

[0011] FIGS. 2A-2E illustrate a process for attaching a microelectronic substrate to a support member in accordance with an embodiment of the invention.

[0012] FIGS. 3A-3E illustrate an in-line process for attaching a microelectronic substrate to a support member in accordance with another embodiment of the invention.

[0013]FIG. 4 is a partially schematic isometric view of a support member having attachment structures in accordance with another embodiment of the invention.

[0014]FIG. 5 is a cross-sectional view of a microelectronic package having attachment structures in accordance with still another embodiment of the invention.

[0015]FIG. 6 is a cross-sectional view of a microelectronic substrate mounted to a support member to form a package in accordance with another embodiment of the invention.

[0016]FIG. 7 is a cross-sectional view of two microelectronic substrates attached to each other with attachment structures in accordance with another embodiment of the invention.

DETAILED DESCRIPTION

[0017] The present disclosure describes microelectronic substrate packages and methods for forming such packages. The term “microelectronic substrate” is used throughout to include substrates upon which and/or in which microelectronic circuits or components, data storage elements or layers, and/or vias or conductive lines are or can be fabricated. Many specific details of certain embodiments of the invention are set forth in the following description and in FIGS. 2A-7 to provide a thorough understanding of these embodiments. One skilled in the art, however, will understand that the present invention may have additional embodiments, and that the invention may be practiced without several of the details described below.

[0018] FIGS. 2A-2E illustrate a process for attaching a microelectronic substrate to a support member to form a microelectronic package in accordance with an embodiment of the invention. Referring first to FIG. 2A, the process can include providing a support member 120 (such as a printed circuit board) having a generally flat, planar shape with a first surface 123 and a second surface 124 facing opposite from the first surface 123. An aperture 121 can extend through the support member 120 from the first surface 123 to the second surface 124 to receive conductive couplers, as described in greater detail below with reference to FIG. 2E.

[0019] Referring now to FIG. 2B, one or more attachment structures 140 (two are shown in FIG. 2B) can be disposed on the support member 120. Each attachment structure 140 can include a projection 141 that extends away from the first surface 123. The projections 141 can be formed from any of a variety of materials in accordance with any of a variety of methods. For example, the projections 141 can include a conductive material, such as copper or aluminum, disposed on the support member 120 in a process such as a chemical vapor deposition, physical vapor deposition, or electrochemical deposition process. The projections 141 can then be shaped using conventional etching techniques. Alternatively, the projections 141 can include nonconductive materials, such as a solder mask material, an epoxy material, or an adhesive strip (e.g., a tape material). In one embodiment, the projections 141 can include a flowable die attach material, as described in greater detail below with reference to FIGS. 3A-3E. In another embodiment, the projections 141 can be formed integrally with the support member 120, for example during the initial manufacture of the support member 120. In any of these embodiments, the projections 141 can be positioned to support a microelectronic substrate relative to the support member 120.

[0020]FIG. 2C is a cross-sectional view of the support member 120 shown in FIG. 2B, with adhesive material portions 142 disposed on each of the projections 141. The adhesive materials portions 142 can include a conventional die attach material, such as QMI 536, available from Dexter Electronic Materials, a business of Loktite Corporation of Rocky Hills, Conn., or 2025D, available from Ablestik of Rancho Dominguez, Calif. In other embodiments, the adhesive material portions 142 can include other materials. For example, the adhesive material portions 142 can include adhesive tape strips, such as double-backed tape strips. In any of these embodiments, the adhesive material portions 142 can be selected to adhere to both the projection 141 and a microelectronic substrate, as described in greater detail below with reference to FIG. 2D.

[0021] Referring now to FIG. 2D, a microelectronic substrate 130 can be connected to and/or carried by the attachment structures 140 by contacting the microelectronic substrate 130 with the adhesive material portions 142 to form a microelectronic package 110. Accordingly, the attachment structures 140 can include a first joint 143 at the interface with the support member 120, and a second joint 144 at the interface with the microelectronic substrate 130. In some embodiments, the first joint 143 and the second joint 144 can be selected to have different strengths. For example, if the support member 120, the microelectronic substrate 130, and/or or the attachment structure 140 have unequal coefficients of thermal expansion (CTEs), and this mismatch is large enough to cause the connection between the support member 120 and the microelectronic substrate 130 to fail, it may be desirable to have the failure occur at the first joint 143 (where the attachment structure 140 joins the support member 120) rather than at the second joint 144 (where the attachment structure 140 joins the microelectronic substrate 130). In particular, if the attachment structure 140 can cause damage to the component from which it separates, it may be desirable to confine such damage to the support member 120 rather than allow the microelectronic substrate 130 to be damaged. In one embodiment for which the strength of the first joint 143 is lower than the strength of the second joint 144, the projections 141 can include the QMI 536 material referred to above, and the adhesive material portions 142 can include 2025D die attach adhesive. In other embodiments, other materials can be selected for the projections 141 and the adhesive material portions 142. In any of these embodiments, the adhesive material portions 142 can include a material that is at least initially flowable and is disposed in its flowable state on the projection 141.

[0022] In one aspect of an embodiment shown in FIG. 2D, portions of the attachment structures 140 can include electrically conductive materials, but the attachment structures 140 do not provide a conductive link between the support member 120 and the microelectronic substrate 130. For example, the projections 141 can include an electrically conductive material while the adhesive material 142 includes an insulative material. In other embodiments, other portions of the attachment structures 140 (such as the projections 141) can be insulative so that the attachment structures 140 do not provide a conductive link between the support member 120 and the microelectronic substrate 130. Instead, electrical communication between these components can be provided by separate conductive couplers, as described below with reference to FIG. 2E.

[0023] As shown in FIG. 2E, the microelectronic substrate 130 can be electrically connected to the support member 120 with conductive couplers 132, such as wire bonds. For example, the conductive couplers 132 can extend between substrate bond pads 131 positioned on the lower surface of the microelectronic substrate 130, and support member bond pads 122 positioned on the second surface 124 of the support member 120. Accordingly, the conductive couplers 132 can extend through the aperture 121 of the support member 120. An encapsulant 111 can then be disposed over the microelectronic substrate 130 and at least a portion of the support member 120 to protect the physical and electrical connections between the microelectronic substrate 130 and the support member 120. Alternatively, the encapsulant 111 can be eliminated. For example, the microelectronic substrate 130 and the associated electrical connections can be protected with a hollow cap disposed over the support member 120.

[0024] In another aspect of an embodiment shown in FIG. 2E, a distance D1 between the microelectronic substrate 130 and the support member 120 (i.e., the height of the attachment structure 140) can be selected to enhance the performance of the package 110. For example, in one embodiment, the distance D1 can be selected to be greater than 25 microns (the distance conventionally achievable with an epoxy bond) and, in a further aspect of this embodiment, the distance D1 can be selected to be 35 microns or greater. In still a further aspect of this embodiment, the distance D1 can be selected to be about 75 microns, or 100 microns, or greater to reduce the likelihood for filler material disposed in the encapsulant 111 to impinge on and damage the microelectronic substrate 130.

[0025] In another aspect of an embodiment shown in FIG. 2E, a distance D2 (by which the projection 141 extends above the support member 120), and a distance D3 (by which the adhesive material volume 142 extends above the projection 141) can be selected in a variety of manners to achieve the overall separation distance D1 described above. For example, D2 can be relatively large and D3 relatively small to reduce the volume occupied by the adhesive material 142. In other embodiments, the relative values of D2 and D3 can be reversed. In one embodiment in which the projection 141 is formed from an initially flowable material such as epoxy, the distance D2 can have a value of from about 8 microns to about 25 microns.

[0026] In yet another aspect of an embodiment described above with reference to FIG. 2E, the lateral extent of the attachment structures 140 can be selected to enhance the performance of the package 110. For example, the attachment structures 140 can be positioned only beneath the microelectronic substrate 130, rather than extending around the sides of the microelectronic substrate 130 as typically occurs with some conventional epoxy bonds. An advantage of this arrangement, when compared to some conventional epoxy bonds is that attachment structures 140 can be less likely to impose damaging stresses on the microelectronic substrate 130.

[0027] In a further aspect of this embodiment, a lateral extent W1 of the attachment structure 140 can be significantly less than a lateral extent W2 of the region of the microelectronic substrate 130 that overlaps the support member 120. For example, in one embodiment, W1 can have a value of from about ⅓ to about ½ of the value of W2. A feature of this arrangement is that the volume of the attachment structure 140 can be reduced relative to the overall volume of the encapsulant 111. An advantage of this arrangement is that it can reduce or eliminate damage caused by CTE mismatch. For example, the encapsulant 111 may have a CTE that is more closely matched to that of the microelectronic substrate 130 and/or the support member 120, while the attachment structure 140 may have a CTE quite different from that of the microelectronic substrate 130 and/or the support member 120. Accordingly, by controlling the lateral extent W1 of the attachment structures 140, the fraction of the volume between the support member 120 and the microelectronic substrate 130 occupied by the attachment structure 140 can be reduced compared with some conventional arrangements. As a result, the attachment structure 140 can be less likely to fail or cause the microelectronic substrate 130 to fail when the package 110 undergoes thermal excursions. Another feature of this arrangement is that the attachment structure 140 can be recessed outwardly from the edge of the aperture 121. An advantage of this feature is that the potential high stress at the interface between the attachment structure 140 and the encapsulant 111 can be shifted outwardly and can be less likely than existing arrangements (such as that described above with reference to FIG. 1B) to crack the encapsulant 111.

[0028] FIGS. 3A-3E schematically illustrate a process for forming a microelectronic package 110 generally similar to that described above with reference to FIGS. 2A-2E. In one aspect of this embodiment, the process can be performed by in-line die attach tools, such as are available from Datacon of Radfeld/Tyrole, Austria, or ESEC of Cham, Switzerland. In other embodiments, the process can be performed by other tools.

[0029] Referring first to FIG. 3A, the process can include providing a support member 120 having an aperture 121. As shown in FIG. 3B, the support member 120 can be positioned beneath a dispense nozzle 350. The dispense nozzle 350 can dispose two quantities of a first material 345 onto the support member 120, while the first material 345 is in a flowable state, to form two projections 341 extending away from the first surface 123 of the support member 120. The projections 341 can define, at least in part, corresponding attachment structures 340. In one embodiment, the dispense nozzle 350 can dispense a conventional die-attach material, such as QMI 536 or 2025D, described above. In other embodiments, the dispense nozzle 350 can dispose other initially flowable materials. In any of these embodiments, the amount of the first material 345 dispensed on the support member 120 and the distance D2 by which the resulting projections 341 extend beyond the first surface 123 can be low enough that the projections 341 maintain their shape without collapsing or slumping. For example, the projections 341 can have a height of from about 8 microns to about 25 microns in one embodiment.

[0030] As shown in FIG. 3C, the flowability of the first material 345 can be reduced or eliminated after it has been dispensed on the support member 120, for example, by applying heat to the first material 345. In one aspect of this embodiment, the first material 345 can be a thermoset material and can be partially cured (e.g., to B-stage) or fully cured. In a specific aspect of this embodiment, the first material 345 can be “snap cured”, for example by exposure to elevated temperatures from about 150° C. to about 200° C. for a period of three seconds or less. In other embodiments, the first material 345 can be exposed to other temperatures and/or can be exposed for other time periods, for example, time periods of up to about ten seconds. In still further embodiments, the flowability of the first material 345 can be reduced by other methods, for example, by cooling. In any of these embodiments, by at least reducing the flowability of the first material 345, the material 345 will tend to retain its shape and height and can more stably and securely support a second material, as described in greater detail below with reference to FIG. 3D.

[0031] Referring now to FIG. 3D, a second material 346 can be disposed on each of the projections 341 while the second material 346 is in a flowable state to increase the height of the corresponding attachment structures 340. In one embodiment, the second material 346 can have a composition identical to that of the first material 345. Alternatively, the second material 346 can have a different composition than that of the first material 345. In either embodiment, the second material 346 can be dispensed on the projections 341 by the same dispense nozzle 350 that dispensed the first material 345, or by a different dispense nozzle. In any of these embodiments, the second material 346 can have adhesive properties, so as to adhere to the first material 345 and to the microelectronic substrate 130, as described below with reference to FIG. 3E.

[0032] Referring now to FIG. 3E, the microelectronic substrate 130 can be attached to the second material 346 of the attachment structures 340. The resulting package 110 can then be encapsulated after the microelectronic substrate 130 is electrically coupled to the support member 120. Accordingly, the foregoing process can include sequentially disposing first and second flowable materials to build up attachment structures having heights, widths, and bond strengths generally similar to those described above with reference to FIGS. 2A-2E. The in-line arrangement of this process can result in an efficient and effective package formation procedure.

[0033] In other embodiments, the attachment structures and packages described above with reference to FIGS. 2A-3E can have other arrangements. For example, referring to FIG. 4, the support member 120 can include a plurality of attachment structures 440 that are arranged in discrete columns rather than continuous strips. Each attachment structure 440 can include a projection 441 formed, for example, from the first material 345. Alternatively, the projections 441 can include non-flowable materials. Each attachment structure 440 can further include a second material 346 disposed on the projection 441. The second material 346 can be applied in a manner generally similar to any of those described above with reference to FIGS. 2A-3E. In one aspect of this embodiment, the attachment structures 440 can have a generally circular cross-sectional shape and in other embodiments, the attachment structure 440 can have other shapes. In one embodiment, the attachment structures 440 can be arranged in rows, and in other embodiments the attachment structures 440 can be arranged in other patterns or arrays. In any of these embodiments, the attachment structures 440 can be connected to a corresponding microelectronic substrate 130 (not shown in FIG. 4) in a manner generally similar to that described above.

[0034]FIG. 5 is a cross-sectional view of a package 510 having the microelectronic substrate 130 connected to the support member 120 with attachment structures 540 in accordance with another embodiment of the invention. In one aspect of this embodiment, each attachment structure 540 can include the first material 345, the second material 346 and a third material 547. In one aspect of this embodiment, the flowability of the first material 345 can be reduced before applying the second material 346, and the flowability of the second material 346 can be reduced before applying the third material 547. Alternatively, the first material 345 can be replaced with a conductive or a nonconductive material disposed by processes generally similar to those described above with reference to FIG. 2B. In still further embodiments, the attachment structures 540 can include more than three sequentially disposed quantities of material to achieve the desired separation distance D1 and/or other characteristics.

[0035]FIG. 6 illustrates a package 610 having a microelectronic substrate 630 supported on a support member 620 in accordance with another embodiment of the invention. In one aspect of this embodiment, the microelectronic substrate 630 can be attached to the support member 620 with attachment structures 640 having characteristics generally similar to any of those described above with reference to FIGS. 2A-5. In a further aspect of this embodiment, the package 610 can have a “chip on board” configuration. Accordingly, the support member 620 can have a first surface 623 and a second surface 624 facing opposite from the first surface 623. The microelectronic substrate 630 can have a first surface 634 and a second surface 635 facing opposite the first surface 634 and facing toward the first surface 623 of the support member 620. The first surface 634 of the microelectronic substrate 630 can include substrate bond pads 631 which are connected with conductive couplers 632 (such as wire bonds) to corresponding support member bond pads 622 positioned on the first surface 623 of the support member 620. The physical and electrical connections between the microelectronic substrate 630 and the support member 620 can be protected, for example, with an encapsulant, a shell, or a cap.

[0036]FIG. 7 illustrates a microelectronic package 710 having a plurality of microelectronic substrates connected to each other in accordance with another embodiment of the invention. In one aspect of this embodiment, the package 710 can include a first microelectronic substrate 730 a having first bond pads 731 a. A second microelectronic substrate 730 b can be attached to the first microelectronic substrate 730 a with attachment structures 740 having configurations generally similar to any of those described above with reference to FIGS. 2A-5. The second microelectronic substrate 730 b can include second bond pads 731 b connected to the first bond pads 731 a of the first microelectronic substrate 730 a with conductive couplers 732, such as wire bonds. Solder balls 733 or other conductive devices can provide for electrical communication to and from the package 710.

[0037] From the foregoing, it will be appreciated that specific embodiments of the invention have been described herein for purposes of illustration, but that various modifications may be made without deviating from the spirit and scope of the invention. Accordingly, the invention is not limited except as by the appended claims. 

I/we claim:
 1. A method for forming a microelectronic package, comprising: providing a support member having a first surface, a second surface facing opposite from the first surface, and a projection extending away from the first surface; forming an attachment structure by applying a quantity of adhesive material to the projection; connecting the adhesive material to a microelectronic substrate with a surface of the microelectronic substrate facing toward the first surface of the support member and with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member; and electrically connecting the microelectronic substrate and the support member.
 2. The method of claim 1, further comprising forming the projection by disposing a material on the support member while the material is at least partially flowable and then at least partially reducing a flowability of the material.
 3. The method of claim 1 wherein the adhesive material is the second of two adhesive materials, and wherein the method further comprises: selecting a first adhesive material to have a composition at least generally the same as a composition of the second adhesive material; and forming the projection by disposing the first adhesive material on the support member while the first adhesive material is at least partially flowable and then at least partially reducing a flowability of the first adhesive material before applying the second adhesive material.
 4. The method of claim 1 wherein the adhesive material is the second of two adhesive materials, and wherein the method further comprises: selecting a first adhesive material to have a composition different than a composition of the second adhesive material; and forming the projection by disposing the first adhesive material on the support member while the first adhesive material is at least partially flowable and then at least partially reducing a flowability of the first adhesive material before applying the second adhesive material.
 5. The method of claim 1 wherein providing the support member includes providing the support member and disposing the projection on the support member.
 6. The method of claim 1, further comprising selecting the projection to include an electrically conductive material.
 7. The method of claim 1, further comprising selecting the projection to include at least one of copper and aluminum.
 8. The method of claim 1, further comprising selecting the projection to include an electrically non-conductive material.
 9. The method of claim 1, further comprising selecting the projection to include a solder mask material.
 10. The method of claim 1, further comprising selecting the projection to include a material different than the adhesive material.
 11. The method of claim 1 wherein a portion of the surface of the microelectronic substrate directly faces the first surface of the support member and wherein forming the attachment structure includes forming the attachment structure to extend from about ⅓ to about ½ of a width of the surface portion facing directly toward the support member.
 12. A method for forming a microelectronic package, comprising: forming an attachment structure by disposing a first quantity of material on at least one of a microelectronic substrate and a support member while the first quantity of material is at least partially flowable; at least partially reducing a flowability of the first quantity of material; applying a second quantity of material to the attachment structure after at least partially reducing the flowability of the first quantity of material; connecting the attachment structure to the other of the microelectronic substrate and the support member, the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member; and electrically connecting the microelectronic substrate and the support member.
 13. The method of claim 12 wherein connecting the attachment structure to the other of the microelectronic substrate and the support member includes contacting the second quantity of material with the other of the microelectronic substrate and the support member.
 14. The method of claim 12 wherein at least partially reducing a flowability of the first quantity of material includes at least partially curing the first quantity of material.
 15. The method of claim 12 wherein at least partially reducing a flowability of the first quantity of material includes at least partially curing the first quantity of material for about three seconds or less.
 16. The method of claim 12 wherein at least partially reducing a flowability of the first quantity of material includes at least partially curing the first quantity of material for about ten seconds or less.
 17. The method of claim 12 wherein disposing the first quantity of material includes disposing the first quantity of material to a thickness of from about 8 microns to about 25 microns.
 18. The method of claim 12 wherein disposing the first quantity of material includes disposing the first quantity of material on a surface of the at least one of the microelectronic substrate and the support member along an elongated axis generally in the plane of the surface.
 19. The method of claim 12 wherein disposing the first quantity of material includes disposing the first quantity of material on a surface of the at least one of the microelectronic substrate and the support member to have a generally circular cross-sectional shape and be approximately centered on a point on the surface.
 20. The method of claim 12 wherein disposing the first quantity of material includes disposing a plurality of first quantities of material at a corresponding plurality of sites on the at least one of the microelectronic substrate and the support member to form a corresponding plurality of attachment members.
 21. The method of claim 12 wherein electrically connecting the microelectronic substrate and the support member includes wire bonding the microelectronic substrate and the support member.
 22. The method of claim 12, further comprising disposing an encapsulating material around at least a portion of at least one of the microelectronic substrate, the support member and the attachment structure.
 23. The method of claim 12, further comprising selecting at least one of the first and second quantities of material to include an epoxy.
 24. The method of claim 12, further comprising adding at least a third quantity of material to the attachment structure, with the attachment structure projecting from the at least one of the microelectronic substrate and the support member by a distance of at least about 75 microns.
 25. The method of claim 12, further comprising selecting the first quantity of material to have a first composition and the second quantity of material to have a second composition at least approximately the same as the first composition.
 26. The method of claim 12, further comprising selecting the first quantity of material to have a first composition and the second quantity of material to have a second composition different than the first composition.
 27. The method of claim 12 wherein disposing the first quantity of material includes disposing the first quantity of material on the support member to form a first joint having a first bond strength, and wherein the method further comprises selecting the second quantity of material to have a second bond strength at a second joint with the microelectronic substrate, the second bond strength being greater than the first bond strength.
 28. The method of claim 12, further comprising: selecting the first quantity of material to have a first composition; selecting the second quantity of material to have a second composition different than the first composition; forming a first joint between the first quantity of material and the support member, the first joint having a first bond strength; and forming a second joint between the second quantity of material and the microelectronic substrate, the second joint having a second bond strength, the second bond strength being greater than the first bond strength.
 29. The method of claim 12 wherein applying the second quantity of material includes applying the second quantity of material while it is at least partially flowable, and wherein the method further comprises: at least partially reducing a flowability of the second quantity of material; and applying a third quantity of material to the second quantity of material while the third quantity of material is at least partially flowable, wherein connecting the attachment structure to the other of the microelectronic substrate and the support member includes contacting the third quantity of material with the other of the microelectronic substrate and the support member.
 30. A method for forming a microelectronic package, comprising: forming an attachment structure by disposing a first quantity of material on a support member, the first quantity of material having a first composition; forming a first joint between the first quantity of material and the support member, the first joint having a first bond strength; applying a second quantity of material to first quantity of material, the second quantity of material having a second composition different than the first composition; forming a second joint between the second quantity of material and the microelectronic substrate, the second joint having a second bond strength, the second bond strength being greater than the first bond strength, wherein the attachment structure provides no electrically conductive link between the microelectronic substrate and the support member; and electrically connecting the microelectronic substrate and the support member.
 31. The method of claim 30 wherein disposing the first quantity of material includes disposing the first quantity of material while it is at least partially flowable, and where the method further comprises at least partially reducing a flowability of the first quantity of material prior to applying the second quantity of material.
 32. The method of claim 30 wherein electrically connecting the microelectronic substrate and the support member includes wire bonding the microelectronic substrate and the support member.
 33. The method of claim 30, further comprising disposing an encapsulating material around at least a portion of at least one of the microelectronic substrate, the support member and the attachment structure.
 34. The method of claim 30, further comprising selecting at least one of the first and second quantities of material to include an epoxy.
 35. A method for forming a microelectronic package, comprising: forming an attachment structure by disposing a first quantity of material on at least one of a first microelectronic substrate and a second microelectronic substrate while the first quantity of material is at least partially flowable; at least partially reducing a flowability of the first quantity of material; applying a second quantity of material to the first quantity of material while the second quantity of material is at least partially flowable and after at least partially reducing the flowability of the first quantity of material; connecting the attachment structure to the other of the first microelectronic substrate and the second microelectronic substrate, the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member; and electrically connecting the first and second microelectronic substrates.
 36. The method of claim 35 wherein connecting the attachment structure to the other of the microelectronic substrate and the support member includes contacting the second quantity of material with the other of the microelectronic substrate and the support member.
 37. The method of claim 35 wherein at least partially reducing a flowability of the first quantity of material includes at least partially curing the first quantity of material.
 38. The method of claim 35 wherein at least partially reducing a flowability of the first quantity of material includes at least partially curing the first quantity of material for about three seconds or less.
 39. The method of claim 35 wherein disposing the first quantity of material includes disposing the first quantity of material to a thickness of from about 8 microns to about 25 microns.
 40. The method of claim 35 wherein disposing the first quantity of material includes disposing a plurality of first quantities of material at a corresponding plurality of sites on the at least one of the first microelectronic substrate and the second microelectronic substrate to form a corresponding plurality of attachment members.
 41. The method of claim 35 wherein electrically connecting the first and second microelectronic substrates includes wire bonding the microelectronic substrates to each other.
 42. The method of claim 35, further comprising disposing an encapsulating material around at least a portion of at least one of the first and second microelectronic substrates.
 43. The method of claim 35, further comprising selecting at least one of the first and second quantities of material to include an epoxy.
 44. The method of claim 35, further comprising selecting the first quantity of material to have a first composition and the second quantity of material to have a second composition at least approximately the same as the first composition.
 45. A method for forming a microelectronic package, comprising: forming an attachment structure depending from at least one of a microelectronic substrate and a support member by disposing at least a first quantity of material on the at least one of the microelectronic substrate and the support member while the first quantity of material is at least partially flowable, the attachment structure projecting from the at least one of the microelectronic substrate and the support member by a distance of about 35 microns or more; connecting the attachment structure to the other of the microelectronic substrate and the support member with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member; and electrically connecting the microelectronic substrate and the support member.
 46. The method of claim 45, further comprising disposing an encapsulating material adjacent to at least one of the microelectronic substrate, the support member and the attachment structure.
 47. The method of claim 45, further comprising: at least partially reducing a flowability of the first quantity of material; and applying a second quantity of material to the attachment structure while the second quantity of material is at least partially flowable and after at least partially reducing the flowability of the first quantity of material, and wherein connecting the attachment structure to the other of the microelectronic substrate and the support member includes connecting the other of the microelectronic substrate and the support member to the second quantity of material.
 48. The method of claim 45 wherein disposing at least a first quantity of material includes disposing the first quantity of material to project by a distance of less than 35 microns, and wherein the method further comprises: at least partially reducing a flowability of the first quantity of material; and applying a second quantity of material to the attachment structure while the second quantity of material is at least partially flowable and after at least partially reducing the flowability of the first quantity of material, and wherein connecting the attachment structure to the other of the microelectronic substrate and the support member includes connecting the other of the microelectronic substrate and the support member to the second quantity of material.
 49. A method for forming a microelectronic package, comprising: providing a support member having a first side and a second side facing opposite from the first side, the support member having a slot extending through the support member from the first side to the second side, the slot having a first edge and a second edge; disposing a first volume of material on the first side of the support member along the first edge of the slot while the first volume is in an at least partially flowable state; disposing a second volume of material on the first side of the support member along the second edge of the slot while the second volume is in an at least partially flowable state; at least partially curing the first and second volumes of material; disposing a third volume of material on the first volume of material while the third volume is in an at least partially flowable state; disposing a fourth volume of material on the second volume of material while the fourth volume is in an at least partially flowable state; attaching a microelectronic substrate to the second and fourth volumes of material with the first, second, third and fourth volumes providing no conductive link between the microelectronic substrate and the support member; and connecting conductive members between the microelectronic substrate and the support member with the conductive members extending through the slot.
 50. The method of claim 49, further comprising selecting the first, second, third and fourth volumes of material to have approximately the same composition.
 51. The method of claim 49, further comprising selecting the first and second volumes of material to have a first composition and selecting the third and fourth volumes of material to have a second composition different than the first composition.
 52. A method for forming a microelectronic package, comprising: providing a support member having a first surface, a second surface facing opposite from the first surface, and an aperture extending through the support member from the first surface to the second surface; forming an attachment structure by applying a quantity of adhesive material to at least one of the support member and a microelectronic substrate while the adhesive material is at least partially flowable; connecting the adhesive material to the other of the microelectronic substrate and the support member with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member, and with the attachment structure being recessed outwardly from an edge of the aperture; and electrically connecting the microelectronic substrate and the support member.
 53. The method of claim 52, further comprising at least partially reducing a flowability of the adhesive material after applying the adhesive material to the at least one of the microelectronic substrate and the support member.
 54. The method of claim 52 wherein the adhesive material is the second of two adhesive materials, and wherein the method further comprises: selecting a first adhesive material to have a composition at least generally the same as a composition of the second adhesive material; and forming the attachment structure by disposing the first adhesive material on the support member while the first adhesive material is at least partially flowable and then at least partially reducing a flowability of the first adhesive material before applying the second adhesive material to the first adhesive material.
 55. The method of claim 52 wherein electrically connecting the microelectronic substrate and the support member includes passing a wire bond through the aperture and connecting the wire bond between the microelectronic substrate and the support member.
 56. A microelectronic package, comprising: a support member having a first surface, a second surface facing opposite from the first surface, and a projection extending away from the first surface; a microelectronic substrate having a surface facing toward the first surface of the support member; a quantity of adhesive material disposed on the projection, the adhesive material and the projection forming an attachment structure, the attachment structure being disposed between the microelectronic substrate and the support member and being attached to at least one of the microelectronic substrate and the support member, the attachment structure forming no electrically conductive link between the microelectronic substrate and the support member; and a conductive coupler between the microelectronic substrate and the support member.
 57. The package of claim 52 wherein the projection includes an electrically conductive material.
 58. The package of claim 52 wherein the projection includes at least one of copper and aluminum.
 59. The package of claim 52 wherein the projection includes a solder mask material.
 60. The package of claim 52 wherein the projection has a first composition and the adhesive material has a second composition different than the first composition.
 61. The package of claim 52 wherein the projection has a first composition and the adhesive material has a second composition at least generally similar to the first composition.
 62. The package of claim 52 wherein the projection includes a material disposed on the support member while the material is at least partially flowable.
 63. The package of claim 52 wherein a portion of the surface of the microelectronic substrate faces directly toward the first surface of the support member, and wherein the attachment structure has a width of from about ⅓ to about ½ of a width of the surface portion facing directly toward the support member.
 64. A microelectronic package, comprising: a support member having a first surface, a second surface facing opposite the first surface; an attachment structure that includes a projection extending away from the first surface, the attachment structure further including a quantity of adhesive material applied to the projection while the adhesive material is at least partially flowable; a microelectronic substrate connected to the attachment structure with a surface of the microelectronic substrate facing toward the first surface of the support member and with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member; and a conductive link between the microelectronic substrate and the support member.
 65. The package of claim 60 wherein the projection includes an electrically conductive material.
 66. The package of claim 60 wherein the projection includes at least one of copper and aluminum.
 67. The package of claim 60 wherein the projection includes a solder mask material.
 68. The package of claim 60 wherein the projection has a first composition and the adhesive material has a second composition different than the first composition.
 69. The package of claim 60 wherein the projection has a first composition and the adhesive material has a second composition different than the first composition.
 70. The package of claim 60 wherein the projection includes a material disposed on the support member while the material is at least partially flowable and wherein the adhesive material is applied to the projection after at least partially reducing a flowability of the material.
 71. The package of claim 60 wherein the adhesive material is the second of two adhesive materials, and wherein the projection includes a first adhesive material having a composition at least generally the same as a composition of the second adhesive material.
 72. The package of claim 60 wherein the adhesive material is the second of two adhesive materials, and wherein the projection includes a first adhesive material having a composition different than a composition of the second adhesive material.
 73. A microelectronic package, comprising: a support member; a microelectronic substrate positioned at least proximate to the support member; an attachment structure having a first quantity of material disposed on at least one of the microelectronic substrate and the support member and a second quantity of material disposed on the first quantity of material, the attachment structure being positioned between the support member and the microelectronic substrate and being attached to at least one of the support member and the microelectronic substrate, the attachment structure forming no electrically conductive link between the support member and the microelectronic substrate; and a conductive coupler between the microelectronic substrate and the support member.
 74. The package of claim 69 wherein the second quantity of material is attached to the microelectronic substrate.
 75. The package of claim 69 wherein the first quantity of material is at least partially cured before the second quantity of material is disposed on the first quantity of material.
 76. The package of claim 69 wherein the first quantity of material has a thickness of from about 8 microns to about 25 microns.
 77. The package of claim 69 wherein the first quantity of material is positioned on a surface of the at least one of the microelectronic substrate and the support member and is elongated along an axis generally in the plane of the surface.
 78. The package of claim 69 wherein the attachment structure has an at least approximately round cross-sectional shape.
 79. The package of claim 69 wherein the attachment structure is one of a plurality of attachment structures.
 80. The package of claim 69 wherein the conductive coupler includes a wire bond connected between the microelectronic substrate and the support member.
 81. The package of claim 69, further comprising an encapsulating material disposed around at least a portion of at least one of the microelectronic substrate, the support member and the attachment structure.
 82. The package of claim 69 wherein at least one of the first and second quantities of material includes an epoxy.
 83. The package of claim 69 wherein the attachment structure further includes at least a third quantity of material, with the attachment structure projecting from the at least one of the microelectronic substrate and the support member by a distance of at least about 75 microns.
 84. The package of claim 69 wherein the first quantity of material has a first composition and the second quantity of material has a second composition at least approximately the same as the first composition.
 85. The package of claim 69 wherein the first quantity of material has a first composition and the second quantity of material has a second composition different than the first composition.
 86. The package of claim 69 wherein the first quantity of material has a first joint at an interface with the support member, the first joint having a first bond strength, and wherein the second quantity of material has a second joint at an interface with the microelectronic substrate, the second joint having a second bond strength, the second bond strength being greater than the first bond strength.
 87. The package of claim 69 wherein the first quantity of material has a first composition and forms a first joint at the support member, the first joint having a first bond strength, and wherein the second quantity of material has a second composition different than the first composition, the second material forming a second joint at the microelectronic substrate, the second joint having a second bond strength, the second bond strength being greater than the first bond strength.
 88. The package of claim 69, further comprising a third quantity of material disposed on the second quantity of material after a flowability of the second quantity of material has been reduced from a first value to a second value, the third quantity of material contacting the other of the support member and the microelectronic substrate.
 89. A microelectronic package, comprising: a support member; a microelectronic substrate positioned at least proximate to the support member; an attachment structure having a first quantity of material disposed on the support member and a second quantity of material disposed on the first quantity of material, the second quantity of material being attached to the microelectronic substrate, wherein the first quantity of material forms a first joint with the support member, the first joint having a first bond strength, and wherein the second quantity of material forms a second joint with the microelectronic substrate, the second joint having a second bond strength, and wherein the second bond strength is greater than the first bond strength, and wherein the attachment structure forms no electrically conductive link between the microelectronic substrate and the support member; and a conductive coupler between the microelectronic substrate and the support member.
 90. The package of claim 85 wherein the first quantity of material is at least partially cured before the second quantity of material is disposed on the first quantity of material.
 91. The package of claim 85 wherein the first quantity of material has a thickness of from about 8 microns to about 25 microns.
 92. The package of claim 85 wherein the attachment structure is one of a plurality of attachment structures.
 93. The package of claim 85 wherein the conductive coupler includes a wire bond connected between the microelectronic substrate and the support member.
 94. The package of claim 85, further comprising an encapsulating material disposed around at least a portion of at least one of the microelectronic substrate, the support member and the attachment structure.
 95. The package of claim 85 wherein at least one of the first and second quantities of material includes an epoxy.
 96. A microelectronic package, comprising: a first microelectronic substrate; a second microelectronic substrate positioned at least proximate to the first microelectronic substrate; an attachment structure connected between the first and second microelectronic substrates, the attachment structure having a first quantity of material disposed on the first microelectronic substrate and a second quantity of material disposed on the first quantity of material, the attachment structure forming no electrically conductive link between the first and second microelectronic substrates; and a conductive coupler between the first and second microelectronic substrates.
 97. The package of claim 92 wherein the first quantity of material is at least partially cured before the second quantity of material is disposed on the first quantity of material.
 98. The package of claim 92 wherein the first quantity of material has a thickness of from about 8 microns to about 25 microns.
 99. The package of claim 92 wherein the attachment structure is one of a plurality of attachment structures.
 100. The package of claim 92 wherein the conductive coupler includes a wire bond connected between the microelectronic substrate and the support member.
 101. The package of claim 92 further comprising an encapsulating material disposed around at least a portion of at least one of the microelectronic substrate, the support member and the attachment structure.
 102. The package of claim 92 wherein at least one of the first and second quantities of material includes an epoxy.
 103. A microelectronic package, comprising: a support member; a microelectronic substrate positioned proximate to the support member; and an attachment structure formed at least in part from an initially flowable adhesive material disposed in its flowable state proximate to at least one of the microelectronic substrate and the support member, the attachment member being attached to at least one of the microelectronic substrate and the support member and projecting away from the at least one of the microelectronic substrate and the support member by a distance of about 35 microns or more, the attachment structure providing no electrically conductive path between the microelectronic substrate and the support member.
 104. The package of claim 99 wherein the attachment member is attached to both the microelectronic substrate and the support member.
 105. The package of claim 99 wherein the attachment structure includes a first material and a second material disposed on the first material after a flowability of the first material has been reduced from a first value to a second value.
 106. The package of claim 99 wherein the attachment structure includes a projection and an adhesive material disposed on the projection while the adhesive material is in at least partially flowable state.
 107. The package of claim 99 wherein the attachment structure includes an electrically conductive material.
 108. The package of claim 99 wherein the attachment structure projects from the at least one of the support member and the microelectronic substrate by a distance of at least 75 microns.
 109. A microelectronic package, comprising: a support member having a first side and a second side facing opposite from the first side, the support member having a slot extending through the support member from the first side to the second side, the slot having a first edge and a second edge; a first attachment structure disposed on the first side of the support member along the first edge of the slot, the first attachment structure having a first quantity of material disposed on the support member and a second quantity of material disposed on the first quantity of material after a flowability of the first quantity of material has been at least partially reduced from a first value to a second value; a second attachment structure disposed on the first side of the support member along the second edge of the slot, the second attachment structure having a third quantity of material disposed on the support member and a fourth quantity of material disposed on the third quantity of material after a flowability of the third quantity of material has been at least partially reduced from a first value to a second value; a microelectronic substrate attached to the first and second attachment structures with neither attachment structure providing an electrically conductive link between the microelectronic substrate and the support member; and a plurality of conductive couplers extending through the slot and connected to the microelectronic substrate and the support member.
 110. The package of claim 105 wherein the compositions of the first and third quantities of material are different and the compositions of the second and fourth quantities of material are different.
 111. A microelectronic package, comprising: a support member having an aperture with an aperture edge; a microelectronic substrate positioned proximate to the support member; and an attachment structure formed at least in part from an initially flowable adhesive material disposed in its flowable state proximate to at least one of the microelectronic substrate and the support member, the attachment structure being attached to at least one of the microelectronic substrate and the support member and being recessed outwardly away from the edge of the aperture, the attachment structure providing no electrically conductive path between the microelectronic substrate and the support member.
 112. The package of claim 111, further comprising a wire bond connected between the support member and the microelectronic substrate, the wire bond passing through the aperture of the support member.
 113. The package of claim 111 wherein the attachment structure includes a first material and a second material disposed on the first material after a flowability of the first material has been reduced from a first value to a second value.
 114. The package of claim 111 wherein the attachment structure includes a projection and an adhesive material disposed on the projection while the adhesive material is in at least partially flowable state.
 115. The package of claim 111 wherein the attachment structure projects from the at least one of the support member and the microelectronic substrate by a distance of at least 75 microns. 